Sheffield Wednesday remain in the drop zone of the Championship after being denied a precious win by rivals United in a frantic derby at Hillsborough.
The Blades started the better and Eddie Nolan was lucky early on when his attempted clearance hit his own post.
Then, against the run of play, Darren Potter volleyed home the Owls' opener.
That would have been enough to lift them out of the bottom three, but Lee Williamson's free-kick salvaged a draw to leave Wednesday a point from safety.
And the Owls now have only two matches left to try to ensure their survival.
They are a point behind Crystal Palace having played the same amount of games, while Watford are two points clear in 20th with a game in hand on their rivals.
It could have been different for the hosts had Jermaine Johnson made the most of two good efforts late in the game, but as it was the majority of the 35,485 crowd were left disappointed with a draw.
Nolan's near-miss aside, the game had produced few clear chances in the opening half-hour until Richard Cresswell was sent clear by Darius Henderson's pass only to shoot wide for the visitors.
Then came the game's most controversial moment, Johnson appearing to catch Cresswell with an elbow that forced the Blades striker off the field for seven minutes to receive stitches, but referee Chris Foy ruling the incident accidental.
And the visitors' frustration was then compounded when Potter arrived to guide Luke Varney's clipped cross into the corner on the volley.
Wednesday improved thereafter, but could do little to prevent United levelling, Williamson fortunate to see his free-kick from near the left byline drift over everyone's head and into the net off the far post.
Still, though, the hosts could have won it. However, first Johnson's thumping drive was beaten clear by Grant before another effort from the Jamaica international in the dying moments flew high and wide.
It means Wednesday have it all to do if they are retain their Championship status, while United move up into 10th in the table.
Sheffield Wednesday manager Alan Irvine:
"If we can be a bit more clinical up front and just stop getting some awful goals against us in terms of luck, then we've got a chance.
"It's still to a large extent in our own hands.
"If we can match or better Crystal Palace's result next week then it goes to the last game."
Sheffield United manager Kevin Blackwell:
"Seven or eight of those lads are out of contract in two weeks' time and they showed the desire and the passion to want to play here.
"This is a terrific atmosphere. It's a great derby game and arguably should be played in the Premier League.
"It's important that both clubs get themselves sorted out and get back there as quickly as possible."
90:00+4:46 The referee brings the game to a close.
90:00+2:05 Effort on goal by Jermaine Johnson from inside the penalty area goes harmlessly over the bar.
90:00+1:44 Free kick awarded for an unfair challenge on Tom Soares by Darius Henderson. Tommy Spurr restarts play with the free kick.
89:35 Stephen Quinn takes a shot. Blocked by Marcus Tudgay.
88:57 Tommy Spurr challenges Glen Little unfairly and gives away a free kick. Direct free kick taken by Kyle Bartley.
88:39 Luke Varney takes a shot. Comfortable save by Steve Simonsen.
85:00 Jermaine Johnson handles the ball and concedes a free kick. Direct free kick taken by Paul Connolly.
83:46 Effort from 12 yards by Jermaine Johnson. Save made by Steve Simonsen. Corner taken by Tommy Spurr, clearance by Nyron Nosworthy.
82:35 Mark Beevers challenges Henri Camara unfairly and gives away a free kick. Glen Little delivers the ball from the free kick
right-footed from right channel.
82:05 Nick Montgomery sends in a cross, Lee Grant makes a comfortable save.
81:37 Foul by Jermaine Johnson on Chris Morgan, free kick awarded. Kyle Bartley takes the direct free kick.
79:20 The assistant referee flags for offside against Jermaine Johnson. Steve Simonsen restarts play with the free kick.
77:33 Substitution Glen Little on for Lee Williamson.
77:33 Substitution Tom Soares comes on in place of Leon Clarke.
77:33 Henri Camara takes a shot. Save by Lee Grant.
75:44 Richard Cresswell produces a cross.
75:08 The ball is crossed by Richard Cresswell.
73:31 Tommy Spurr takes the inswinging corner, save by Steve Simonsen.
73:23 The ball is crossed by Darren Potter, clearance made by Kyle Bartley.
71:58 Nick Montgomery gives away a free kick for an unfair challenge on Luke Varney. Free kick crossed left-footed by Tommy Spurr
from right channel, save by Steve Simonsen.
70:55 Foul by Luke Varney on Kyle Bartley, free kick awarded. Direct free kick taken by Steve Simonsen.
69:04 The ball is delivered by Henri Camara.
67:03 Lee Williamson concedes a free kick for a foul on Luke Varney. Tommy Spurr takes the free kick.
66:18 Unfair challenge on Jermaine Johnson by Nyron Nosworthy results in a free kick. The free kick is delivered left-footed by
Tommy Spurr from right wing.
65:25 Effort on goal by Jermaine Johnson from just inside the area clears the bar.
61:15 Foul by Leon Clarke on Chris Morgan, free kick awarded. Steve Simonsen restarts play with the free kick.
60:21 Substitution (Sheff Utd) makes a substitution, with Kyle Bartley coming on for Andy Taylor.
59:15 GOAL - Lee Williamson:Sheff Wed 1 - 1 Sheff Utd Lee Williamson scores a goal from just outside the penalty area to the top right corner of the goal. Sheff Wed 1-1 Sheff Utd.
58:36 The free kick is delivered right-footed by Lee Williamson from left by-line,
58:36 Booking Eddie Nolan receives a caution.
58:34 Free kick awarded for a foul by Eddie Nolan on Stephen Quinn.
57:06 Nick Montgomery takes the free kick. Stephen Quinn takes a shot. Save made by Lee Grant.
57:06 Booking The referee shows Stephen Quinn a yellow card.
57:05 Booking James O'Connor goes into the book.
56:23 Foul by James O'Connor on Stephen Quinn, free kick awarded.
53:20 Direct free kick taken by Lee Grant.
53:20 Booking Andy Taylor shown a yellow card.
53:06 Jermaine Johnson fouled by Andy Taylor, the ref awards a free kick.
51:50 Unfair challenge on Darius Henderson by Mark Beevers results in a free kick. Free kick crossed left-footed by Stephen Quinn
from right channel.
51:50 Substitution Henri Camara joins the action as a substitute, replacing James Harper.
48:52 Darius Henderson challenges Darren Purse unfairly and gives away a free kick. Lee Grant restarts play with the free kick.
47:41 Inswinging corner taken by Darren Potter, save by Steve Simonsen.
45:47 Foul by Marcus Tudgay on Nick Montgomery, free kick awarded. Direct free kick taken by Steve Simonsen.
45:01 The second half kicks off.
45:00+5:07 The match has reached half-time.
45:00+4:34 The ball is sent over by Stephen Quinn, comfortable save by Lee Grant.
45:00+3:25 Inswinging corner taken by Tommy Spurr, Close range header by Mark Beevers goes wide of the left-hand post.
45:00+1:40 Andy Taylor takes a corner.
45:00+1:12 The ball is delivered by Paul Connolly, clearance made by Eddie Nolan. Inswinging corner taken by James Harper from the left
by-line, Tommy Spurr makes a clearance.
44:18 Unfair challenge on Nick Montgomery by James O'Connor results in a free kick. Steve Simonsen takes the free kick.
42:44 Tommy Spurr fouled by Darius Henderson, the ref awards a free kick. Direct free kick taken by Lee Grant.
40:57 The assist for the goal came from Luke Varney.
40:57 GOAL - Darren Potter:Sheff Wed 1 - 0 Sheff Utd Darren Potter scores a goal from inside the area to the bottom left corner of the goal. Sheff Wed 1-0 Sheff Utd.
35:52 Free kick awarded for an unfair challenge on Leon Clarke by Paul Connolly. Centre by Darren Potter, Header from deep inside
the area by Tommy Spurr goes over the bar.
35:16 Darren Purse fouled by Darius Henderson, the ref awards a free kick. Direct free kick taken by Darren Purse.
33:48 Richard Cresswell concedes a free kick for a foul on Jermaine Johnson. Direct free kick taken by Lee Grant.
Correction - 31:36 Luke Varney is adjudged to have handled the ball. Steve Simonsen takes the free kick.
31:36 Luke Varney is penalised for handball and concedes a free kick. Paul Connolly takes the free kick.
30:37 Chris Morgan gives away a free kick for an unfair challenge on Marcus Tudgay. Free kick taken by Darren Purse.
30:02 Foul by Jermaine Johnson on Andy Taylor, free kick awarded. Andy Taylor takes the direct free kick.
29:12 Richard Cresswell has an effort at goal from deep inside the area missing to the left of the goal.
27:50 Corner taken right-footed by Darren Potter from the left by-line to the near post, Andy Taylor manages to make a clearance.
27:28 Inswinging corner taken by Darren Potter, Nyron Nosworthy manages to make a clearance.
27:20 The ball is delivered by Leon Clarke, Chris Morgan makes a clearance.
26:10 Stephen Quinn crosses the ball.
25:10 Unfair challenge on Lee Williamson by Marcus Tudgay results in a free kick. Direct free kick taken by Steve Simonsen.
22:44 The offside flag is raised against Jermaine Johnson. Indirect free kick taken by Steve Simonsen.
22:37 Jermaine Johnson produces a cross.
22:27 The ball is sent over by Leon Clarke.
21:45 Free kick awarded for an unfair challenge on Mark Beevers by Darius Henderson. Darren Purse restarts play with the free kick.
20:40 Nick Montgomery challenges Jermaine Johnson unfairly and gives away a free kick. Free kick taken by Darren Purse.
19:19 The referee blows for offside. Lee Grant takes the indirect free kick.
16:42 Paul Connolly sends in a cross, James O'Connor gets a block in.
15:53 Luke Varney takes a shot. Steve Simonsen makes a comfortable save.
10:59 Paul Connolly challenges Marcus Tudgay unfairly and gives away a free kick. Free kick crossed right-footed by Darren Potter.
8:47 Corner taken by Andy Taylor, Darren Purse fouled by Chris Morgan, the ref awards a free kick. Lee Grant restarts play with
the free kick.
8:15 Luke Varney challenges Stephen Quinn unfairly and gives away a free kick. James Harper crosses the ball in from the free kick,
Leon Clarke manages to make a clearance.
6:03 Inswinging corner taken from the left by-line by James Harper, Marcus Tudgay makes a clearance. Outswinging corner taken right-footed
by Andy Taylor, Darius Henderson takes a shot. Clearance by Darren Purse.
3:59 Darius Henderson takes a shot and went wide left of the target.
2:08 Inswinging corner taken by Andy Taylor.
1:11 Darren Purse gives away a free kick for an unfair challenge on Stephen Quinn. The free kick is swung in left-footed by Andy
Taylor, Darren Purse makes a clearance.
0:00 The referee gets the match started.
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